Air Velocity
Air velocity products are engineered to provide accurate and reliable airflow measurements in a wide range of HVAC and industrial applications. These instruments are ideal for monitoring air movement in ducts, clean rooms, fume hoods, and ventilation systems. Designed with precision in mind, air velocity meters and transmitters help ensure systems operate efficiently and within required specifications. Many models offer digital displays, selectable measurement units, and user-friendly interfaces, making them suitable for both field technicians and facility managers.
The product line includes handheld anemometers, vane-style air velocity meters, hot-wire probes, and fixed transmitters. Each device is designed to measure airflow with minimal disruption to the system, providing real-time data for critical decision-making. Air velocity sensors often feature rugged housings for durability in demanding environments and are available in models that support analog or digital outputs for easy integration into building automation systems. These tools also often include temperature compensation for accurate readings under varying environmental conditions.
Analog and Digital Control Signals: The Basics
Digital Signals
Digital signals are represented in either a true or false. There is no gray area with digital signals. An example of this might be a light switch. A light switch is either on or off. Another example of this might be a motor that is running or not running. Digital signals can be generated with both AC and DC circuits with varying voltages, currents and resistance. Some practical examples of using digital signals in an industrial environment might be if a pump is running or not running or a whether a valve is open or closed.
Analog Signals
Analog signals convey information in the form of a range. A light switch might be on or off as a digital signal, but a dimmer switch would be an analog signal. It can be on or off, but it can also be somewhere in between. A practical example of using analog signals in an industrial environment would be if there is a need to measure the level of a tank; whether it's full, empty or somewhere in between. Analog signals can take many different forms with some of the more common being a 4 to 20 milliamp signal or a 0 to 5 or 0 to 10 volt signal.
Communication
Communication in a device can either be sent or received. Whether that data is sent or received depends on the type of information. Is there a need to monitor the status of something? If so, an input needs to be received about that information. Is there a need to control something? If so, an output needs to be sent about what needs to occur. Receiving inputs and setting outputs are both things that can be accomplished by using both digital and analog signal types. Therefore, the signals are referred to as analog outputs (AO), analog inputs (AI), digital inputs (DI) or digital outputs (DO).